Induced superconductivity in graphene grown on rhenium.

SIMAP, Grenoble INP, 1130 rue de la Piscine, BP 75, F-38402 Saint-Martin-d’Heres, France(Dated: January 9, 2014)We report a new way to strongly couple graphene to a superconductor. The graphene monolayerhas been grown directly on top of a superconducting Re(0001) thin lm and characterized by scan-ning tunneling microscopy and spectroscopy. We observed a moire pattern due to the mismatchbetween Re and graphene lattice parameters, that we have simulated with ab initio calculations.The density of states around the Fermi energy appears to be position dependent on this moirepattern. Tunneling spectroscopy performed at 50 mK shows that the superconducting behavior ofgraphene on Re is well described by the Bardeen-Cooper-Schrie er theory and stands for a verygood interface between the graphene and its metallic substrate.